Electric dumb-waiter control.



M. SPAHN & I. GONUOPF.

ELECTRIC DUMB WAITER CONTROL. APPLICATION FILED FBB.27, 1911.

Patented July 23, 1912.

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Specification of Letters Patent. Application filed February 27, 1911.

1,033,286. Patented. July 23, 1912.

Serial No. 811,121.

ment perforated as indicated by 2 1, and is divided by a slot- 27 into two members 25 and 26. Switch shaft 91. extends through perforation 2d, and abell-crank 28 is secured to said shaft in line with slot 27, whereby arms 29, 30of said bell-crank are free to ,extend upward int-ov said slot. Segment member 25 is provided with an inwardly projecting pin 31, and member 26 is'in the same manner the two pins the segment is provided with a series of .perforations 33 adapted to receive a detachable pin or key 34. It is to be noted'that arm 29 is in the of pin 31, while arm- 30 registers with pin .32, but the detachable pin extending entirel'y across when thrown into its path of travel.

Switch shaft 'n. journals in bearings 0, between which is suspended a drum all made of insulating material and rigidly secured to the shaft. A plurality of contact brushes m, y, z, 2, bearing against the periphery of said drum, are arranged in pairs diametrically opposite, and register with contact plates 3, 4 of the drum. Said contact brushes are electrically connected with the motor in any suitable manner to start the motor in forward or reverse'direction, when the switch contacts 3, 4 are brought in contact with either of the pairs of brushes. r

To operate the dumbwaiter, switch crank 5 is turned until a circuit is closed between contacts 3, 4 and brushes 'm, 3 and the motor starts causing shaft f to revolve, its turn revolves shaft 71 with drum 7) and rock-frame 22, until pin 31 of the latter strikes arm 29 of bell-crank 28, whereby said bell-crank is pushed along causing switch shaft n to revolve, until the switch again To all whom it may concern Be it known that we, MICHAEL SPAHN and ISAAC CONCOFF, citizens of the United States, residing at Portland, in the county 5 of Multnomah and State of Oregon, have invented certain new and useful Improvements in Electric Dumb-Waiter Control, of which the following is a specification.

Our invention relates to electric elevators 10 or dumbwaiters, and has for its-object to provide a dumbwaiter of simple, durable and inexpensiveconstruction.

A further object is to devise means, whereby our dumbwaiter is controlled entirely from the basement or central station of the building'which it supplies.

Our dumbwaiter is furthermore so constructed, that the operator,'when the dumb waiter is required at a certain floor, sets a stop corresponding to said floor and throws the starting switch, whereupon the dumbautomatica'lly comes .then to start the dumbwaiter it is necessary for theoperator to re-adjust said stop and to throw the starting switch.

The objects and advantages of our invention are clearly set forth in the following description and illustrated in the appended drawing, of which:

Figure 1 is a perspective plan-view of our controlling device. Fig. 2 is a plan-view of part of Fig. 1, and Fig. 3 shows a modified means ofactuating our controlling 3,5 mechanism.

Referring to Fig. 1, a is an electric motor, I) the drum around which the cable 0 is. wound. The means of suspending the dumbwaiter cage from cable 0 is not shown 40 in the drawing, .such means being commonly used and well known to those versed in the art.

5 From motor a extends a shaft 1, the outer assumes its central position, as shown in end of which is supported by Q1 suitable Fig. 1, and the circuit is opened. To start bearing 9 andprovided with wor. i-threads the dumbwaiter in theopposite direction, hi Drum b is rigidly secured t'p shaft '2', the switch is revolved until a circuit is closed between contacts 3, 42 and brushes 2, 2, whereupon in the manner described rock-frame 22 is caused to oscillate until it strikes arm 30 of bell-crank 28, causing the switch to return to its central position and opening the circuit. If the dumbwaiter is required to stop at an intermediate station,

able pin 34 is inserted'in the proper perforation 33, and the switch thrown, whereupon arm 29 or 30 in the course of the travel of which is mounted in bearings j atright angles to shaft f. Worm-wheel is, rigidly,

afli'xedfio one end of shaft 2', engages the while the oppositeingh of. shaft i is provided with worm threads Z, on which we mount a threaded collar 20 provided with a pin 21,.and the the lower end of a rock-frame in a suitable bearing 23. The upper end of said rock-frame forms a segmade with a pin 82. Between.

path of travel V slot 27 acts upon either arm 0 which in the detachrock-frame 22 is struck by pin 31 or 32, and the whole mechanism is thus brought to a standstill at the desired point. To insure the dumbwaiter coming to a stop exactly at the required point, we provide a brake mechanism which comprises a brake disk 12 secured to shaft f, and a lever 13 journaled in a suitable bearing 14 in close proximity to said brake disk. A brake shoe 15 is hinged on lever 13 and is forced to bear against the periphery of disk 12 by the action of an adjustable weight 16, mounted on the free end of lever 13. To switch shaft 12 is secured a cam 17, on which the free end of lever 13 rest-s. Bv referring to Fig. 1 it is seen how said cam, when switch 6 is thrown in either direction to start the dumbwaiter, raises the end of said lever, and thus releases the brake. When the switch again returns to its central position weight 16 causes the brake to act instantly, and the dumbwaiter to stop suddenly.

F i g. 3 shows how the construction may be simplified by applying bell-crank 22 di rectly to the flange of drum Z), which in that case is provided with worm threads 86 engaging Worm teeth 37 of bell-crank 22.

Having thus described our invention, we claim:

1. In an electric elevator control in combination: a motor, a cable drum, a switch shaft, an insulated switch drum on said shaft, contact plates on the periphery of said switch drum, contact brushes engaging said switch drum on opposite sides, means for manually rotating said switch drum, to close a circuit between saidcontact plates and either set of brushes, means for auto niatically returning said switch drum to its initial position, said means comprising, a

drivingineiiiber operatively connected with the motor, a switch controlling member operatively connected with the switch shaft, said driving member provided with a series of perforations representing the floor stops, and a detachable pin which, when placed in one of said perforations, causes the driving member to engage the controlling member, thereby returning the switch drum to its initial position.

2. In an electric elevator controlling mechanism in combination: a motor, a cable drum, :1 switch shaft, an insulated switch drum rigid on' said shaft, contact plates on the periphery of said switch drum, contact brushes engaging said switch drum on opposite sides, means for manually rotating said switch drum to close a circuit between said contact plates and either set of brushes, a

segmental, bifurcated rock frame rotated by the motor and provided with a series of perforations corresponding to the floor stops.

a bell crank on the switch shaft and riding in the bifurcation of said rock frame, and a pin adapted to lodge in one of said perforations and engaging said bell crank, thereby returning the switch drum to its initial position.

In testimony whereof we affix our tures in presence of two witnesses.

MICHAEL SPAHN. ISAAC CONCOFF.

signalVitnesses L. M. EARL, M. Lucas. 

